15B. एउटा सोलीको अर्धव्यास र छड्के उचाइ 7 : 25 को अनुपातमा छन् । यदि यसको पुरा सतहको क्षेत्रफल 2816 वर्ग से.मि. भए छड्के उचाइ पत्ता लगाउनुहोस् ।
The radius and slant height of a cone are in the ratio of 7 : 25. If its total surface area is 2816 sq. cm, find
the slant height.
गोलीको सतहको नाफल-मियमको याचारको अर्धव्यास 7 से मिल। सोलीको छडके उचाइ

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet

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